Possible Motive Behind Ricin Letters?

In my years of politics, I have heard from many Capitol Hill staffers that Congressmembers hate constituent mail.

Is it possible that someone has found a solution? I tend not to be much of a conspiracy theorist, but I had been wondering about possible motives behind the ricin letters.

Whatever the motive, it appears that writing letters to your congressional representative may soon become a thing of the past. Of course, there is still email, although most of Congress has been ignoring email for years.